After initial osteotomy at the site of #31 with a 2 mm pilot drill at 11.5 mm, insertion of a parallel pin shows that there is enough clearance from the superior border of the Inferior Alveolar Canal (Fig.1 red dashed line).  

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Xin Wei, DDS, PhD, MS 1st edition 09/10/2015, last revision 05/15/2020